How to Change and upgrade my British Airways flight? If you are pondering, How to Change and upgrade my British Airways flight? For further information, you can contact the British Airways customer service assistant contact number +1-800-971-7347 (OTA) or +1-800-247-9297. British Airways provides 24*7 support,and assistance any time for 365 days. Source Url: https://skyairbus.com/blog/how-to-change-and-upgrade-my-british-airways-flight/